DMM8900 SERIES USERS MANUAL

Transcription

1 DMM8900 SERIES USERS MANUAL WARRANTY This instrument is warranted to be free from defects in material and workmanship for a period of one year. Any instrument found defective within one year from the delivery date and returned to the factory with transportation charges prepaid, will be repaired, adjusted, or replaced at no charge to the original purchaser. This warranty does not cover expandable items such as batteries or fuses. If the defect has been caused by a misuse or abnormal operation conditions, the repair will be billed at a nominal cost Read the Users Manual thoroughly before use. SAFETY INFORMATION 8900 series digital multimeters have been designed according to IEC-1010 concerning electronic measuring instruments with an overvoltage category (CAT I) and pollution2. ELECTRICAL SYMBOLS AC (Alternating Current) DC (Direct Current) Important safety information. Refer to the manual. Dangerous voltage may be present. Earth ground Fuse Conforms to European Union directives Double insulated WARNING To avoid possible electric shock or personal injury, follow these guidelines: Do not use the meter if it is damaged. Before you use the meter, inspect the case. Pay particular attention to the insulation surrounding the connectors Inspect the test leads for damaged insulation or exposed metal. Check the test leads for continuity. Replace damaged test leads before you use the meter. Do not use the meter if it operates abnormally. Protection may be impaired. When in doubt, have the meter serviced. Do not operate the meter around explosive gas, vapor, or dust. Do not apply more than the rated voltage, as marked on the meter, between terminals or between any terminal and earth ground. Before use, verify the meter s operation by measuring a known voltage

2 When servicing the meter, use only specified replacement parts. Use with caution when working above 30V ac rms, 42V peak, or 60V dc. Such voltages pose a shock hazard. When using the probes, keep your fingers behind the finger guards on the probes. Connect the common test lead before you connect the live test lead. When you disconnect test leads, disconnect the live test lead first. Remove the test leads from the meter before you open the battery door. Do not operate the meter with the battery door or portions of the cover removed or loosened. To avoid false readings, which could lead to possible electric shock or personal injury, replace the batteries as soon as the low battery indicator ( ) appears CAUTION To avoid possible damage to the meter or to the equipment under test, follow these guidelines: Disconnect circuit power and discharge all high-voltage capacitors before testing resistance, continuity, diodes, or capacitance. Use the proper terminals, function, and range for your measurements. Before measuring current, check the meter's fuses and turn power OFF to the circuit before connecting the meter to the circuit. Before rotating the range switch to change functions, disconnect test leads from the circuit under test. Before attempting to insert transistors for testing, always be sure that the test leads have been disconnected from any measurement circuits. Remove test leads from the Meter before opening the Meter case MAINTENANCE Before opening the case, always disconnect the test leads from all live circuits. For continue protection against fire, replace fuse only with the specified voltage and current ratings: F 250mA/250V (Fast Blown) 5 20 Periodically wipe the case with a damp cloth and mild detergent. Do not use abrasives or solvents. INTRODUCTION DMM8900 series multimeters are compact, rugged, battery-powered and handheld 3 1/2- digit LCD digital multimeters for measuring DC and AC voltage, DC and AC current, resistance and diode, capacitance, inductance, battery, frequency, temperature, transistor and continuity test. The Dual-slope A/D Converter uses C-MOS technology for autozeroing, polarity selection and over-range indication. They are ideal instruments for use in field, laboratory and at home. Following table shows the functions of the series multimeters: Model DCV ACV DCA ACA T Hz L BAT

3 UNFUSED V--- BATT FRONT PANEL DIGITAL MULTIMETER A ma COM BATTV DMM8900 V~ 1. FUNCTION AND RANGE SWITCH This switch is used to select the functions and desired ranges as well as to turn ON/OFF the meter. To extend the life of battery, the switch should be set to "OFF" range when the meter is not in use. 2. DISPLAY 3 1/2-digit LCD. 3. "BATT/V/ " JACK Plug-in connector for the red (positive) test lead for all battery, voltage and resistance measurements. 4. "COM" JACK Plug-in connector for black (ne gative) test lead. 5. " A ma" JACK Plug-in connector for the red (positive) test lead for current (less than 200mA) measurement. 6. "10A" JACK Plug-in connector for the red (positive) test lead for current (between 200mA and 10A) measurement There is no fuse in the built-in circuit for "10A" jack. To use safely, each measurement can not last for more than 10 seconds, and the interval between each measurement must be more than 15 minutes. GENERAL SPECIFICATION Maximum voltage between terminal and earth ground Fuse Power supply Display Sampling rate Measuring method Over-range indication CAT I 500V F 250mA/250V 9V battery, NEDA 1604 or 6F22 3 1/2-digit LCD, 1999 counts 2~3 times/sec. Dual-slope integration A/D converter Only figure "1" displayed on the LCD Polarity indication Operating temperature Storage temperature Low battery indication Size Weight "-" displayed for negative 0 ~40 (32 ~104 ) -10 ~50 (14 ~122 ) " " appears on the LCD 86mm(W) 186mm(D) 33mm(H) Approx. 230g (including a 9V battery) TECHNICAL SPECIFICATIONS is specified for a period of one year after calibration and at 18 ~28 (64 ~82 ) with relative humidity up to 75%. specifications take the form of: ([% of Reading]+[Number of Least Significant Digits])

4 DC VOLTAGE DC CURRENT 200mV 2V 20V 200V 500V 100 V 1mV 10mV 100mV 1V Input impedance: 10M for all ranges (0.5% +1) (0.8% +2) 20 A 200 A 2mA 20mA 200mA 10A Maximum input current: 10A 0.01 A 0.1 A 1 A 10 A 100 A 10mA (0.8% +1) (1.0% +1) (1.2% +1) (2.0% +5) AC VOLTAGE AC CURRENT 200mV 2V 20V 200V 400V 100 V 1mV 10mV 100mV 1V (1.2% +3) (1.2% +3) 200 A 2mA 20mA 200mA 20A(10A) 0.1 A 1 A 10 A 100 A 10mA (1.0% +3) (1.8% +3) (3.0% +7) Input impedance: 10M, for all ranges Frequency : 40Hz ~400Hz Indication: Average (rms of sine wave) Frequency range: 40Hz~400Hz Maximum input current: 10A Indication: Average (rms of sine wave)

5 RESISTANCE 200 2k 20K 200K 2M 20 M 200 M K 10K 100K (0.8% +3) (0.8% +1) (1.0% +2) (5%(rdg-10digits) 10digits) Open circuit voltage: Less than 700mV (2.8V for range 200 M ). When the test leads are shorted together at range 200 M, the meter will display the number 101 on the LCD. The number has to be subtracted from measuring results. CAPACITANCE 2000pF 20nF 200nF F 20 F 200 F 1pF 10pF 100pF 1nF 10nF 100nF (2.5% +3) (5.0% +3) DIODE & CONTINUITY Description Test Condition If the resistance of the circuit under test The forward DC current is is less than 30, the built-in buzzer will approx. 1mA, the reversed DC sound. voltage is approx. 2.8V. The approx. forward voltage drop of the Open circuit voltage approx. 2. diode will be displayed on the LCD. 8V. TRANSISTOR hfe TEST PNP & NPN hfe 0~ Test Current 1b=10 A Test Voltage Vce=2.8V TEMPERATURE (K TYPE PROBE) T -40 ~ ~+1000 FREQUENCY 20KHz 10Hz (1.0% +3 ) (1.5% +15 ) (1.0% +5)

6 BATTERY 1.5V 9V INDUCTANCE Description The working current of the battery will be displayed on the LCD so the quality of the battery could be judged. 2mH 20mH 200mH 2H 20H 1 H 10 H 100 H 1mH 10mH Test Condition Working current is about 40mA. Working current is about 24mA. (3.0% +5) (5.0% +5) OPERATING INSTRUCTIONS- DC Voltage Measurement 1. Connect the red test lead to the "BATT/V/ " jack and the black test lead to the "COM" jack. 2. Set the rotary switch to the desired V range. If the voltage to be measured is not known beforehand, set the range switch to the highest range and then turn down range by range until satisfactory resolution is obtained. 3. Connect the test leads to the source or load to be measured. 4. Read the voltage value displayed on the LCD along with the polarity of the red test lead DC Current Measurement 1. Connect the black test lead to the "COM" jack and the red test lead to the " A ma" jack. (While the current to be measured is between 200mA and 10A, remove the red test lead to the "10A" jack.) 2. Set the rotary switch to the desired A range. If the current to be measured is not known beforehand, set the range switch to the highest range and then turn down range by range until satisfactory resolution is obtained. 3. Open the circuit in which the current is to be measured, and connect the test leads in series with the circuit. 4. Read the current value displayed on the LCD along with the polarity of the red test lead. AC Voltage Measurement 1. Connect the red test lead to the "BATT/V/ " jack and the black test lead to the "COM" jack. 2. Set the rotary switch to the desired V range. If the voltage to be measured is not known beforehand, set the range switch at the highest range and then turn down range by range until satisfactory resolution is obtained. 3. Connect the test leads to the source or load to be measured. 4. Read the voltage value displayed on the LCD. AC Current measurement 1. Connect the black test to the "COM" jack and the red test lead to the " A ma" ack. (While the current to be measured is between 200mA and 10A, remove the red test lead to the "10A" jack.)

7 2. Set the rotary switch to the desired A range. If the current to be measured is not known beforehand, set the range switch at the highest range and then turn down range by range until satisfactory resolution is obtained. 3. Open the circuit in which the current is to be measured, and connect the test leads in series with the circuit. 4. Read the current value displayed on the LCD. Resistance Measurement 1. Connect the red test lead to the "BATT/V/ " jack and the black test lead to the "COM" jack. 2. Set the rotary switch to the desired range. 3. Connect the test leads to the resistor to be measured and read the value displayed on the LCD. Note For resistance about 1M and above, the meter may take a few seconds to stabilize. This is normal for high resistance readings. Capacitance Measurement 1. Set the rotary switch to the desired C range. 2. Connect the capacitor to be measured to the input sockets. Note: Observe polarity when connecting polarized capacitors. When testing large capacitances, note that there will be a certain time lag before the indication Temperature Measurement 1. Connect the K type probe to the K probe jack. 2. Set the rotary switch to the "T " range. 3. Read the temperature value displayed on the LCD. Diode Test 1. Connect the red test lead to the "BATT/V/ " jack and the black test lead to the COM jack. (The polarity of the red test lead is positive "+".) 2. Set the rotary switch to " " range. 3. Connect the red test lead to the anode of the diode to be tested and the black test lead to the cathode of the diode. The approximate forward voltage drop of the diode will be displayed on the LCD. If the connection is reversed, only figure "1" will be shown Transistor Test 1. Set the rotary switch to "hfe" range. 2. Determine whether the transistor to be tested is NPN or PNP, and locate the E, B, C leads. Insert the leads into the proper holes of the hfe socket on the front panel. 3. Read the approximate hfe value at the test condition of base current 10 A and Vce 2.8V. Audible Continuity Test 1. Connect the red test lead to the "BATT/V/ " and the black test lead to the "COM" jack. 2. Set the rotary switch to "" range. 3. Connect the test leads to the two terminals of the circuit to be tested. If the resistance is less than about 30, the built-in buzzer will sound

8 Battery Test 1. Set the rotary switch to the "BAT" range. 2. Connect the black test lead to the "COM" jack and the red test lead to the "BATT/V/ " jack. Connect the test leads separately to the two polar of the battery under test. Inductance Measurement 1. Set the rotary switch to the desired "L" range. 2. Connect the inductor to be measured into the input socket "LX". Battery & Fuse Replacement If " " appears on the LCD, it indicates that the battery should be replaced. To replace the battery, open the case, replace the exhausted battery with the ratings specified: 9V, NEDA 1604 or 6F22, and then close the case. The fuse rarely needs to be replaced and is blown as a result of the operator's error. To replace the fuse, open the case, replace the blown fuse with the ratings specified: F 250mA/250V, and then close the case. ACCESSORIES Users Manual Test Leads 9V Battery (NEDA 1604 or 6F22) 1 copy 1pair 1piece